President Trump said Saturday that he brought up with America’s closest allies the dramatic prospect of completely eliminating tariffs on goods and services, even as he threatened to end all trade with his counterparts if they do not stop what he says are unfair trade practices.

Speaking to reporters at the end of a contentious weekend meeting of the Group of 7 nations in a resort town outside Quebec City, Mr. Trump said that eliminating all trading barriers would be “the ultimate thing.” But he railed about what he called “ridiculous and unacceptable” tariffs on American goods and vowed to get rid of them.

“It’s going to stop. Or we’ll stop trading with them. And that’s a very profitable answer, if we have to do it,” Mr. Trump said, adding, “We’re like the piggy bank that everybody’s robbing and that ends.”